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STA1010 - Statistical methods for science - S2 2025
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Find the standard deviation for the given probability distribution.
x | p(X) | x.P(X) | x2.P(X) |
0 | 0.21 |
|
|
1 | 0.08 |
|
|
2 | 0.08 |
|
|
3 | 0.36 |
|
|
4 | 0.27 |
|
|
X is a random variable with mean 5 and standard deviation 3. If X was performed 6 times, what would the standard deviation of the resulting variable Y formed by the 6Xs? (Answer to one decimal place)
The random variable Y has the following probability distribution:
| y | 1 | 2 | 8 |
| Pr(Y=y) | 0.2 | 0.5 | 0.3 |
The mean or expected value of Y is
Which of the following situations is the most appropriate example for a binomial random variable?
A computer salesman averages 1.5 sales per week. Use the Poisson distribution to find the probability that in a randomly selected week the number of computers sold is 1.